Our Ultrasonic Nebulizer Products is good in quality and competitive in price. We are manufacturer and supplier Ultrasonic Nebulizer Products following your specific requirement. We are looking forward to your E-mail and establishing cooperative relationship with you! We would provide professional Ultrasonic Nebulizer with good services for you!
Ultrasonic Nebulizer Compressor Nebulizer, Air Compressing Nebulizer, Portable Ultrasonic Nebulizer, Ultrasonic Nebulizers Ningbo Cland Medical Instruments Co., Ltd. , http://www.cland-med.com
(2) Identification of crab quality: In order to obtain a good harvest, the quality of crab seedlings is the key. Crab seedlings usually have two kinds of natural seedlings and artificial propagation seedlings. The quality identification method is usually “three-by-one samplingâ€. A look at whether the size of crab seedlings is uniform and whether the individual size is the same. Secondly, whether the body color is the same or not, the body of the crab is yellow-brown, and the lustrous person is better, and the color is inconsistent or the body color is transparent. Looking at the strength of the three activities, using a handful of light pinching and putting it down, those who can disperse quickly are better, and the slower ones are spread out. The last sampling inspection included 1-2 grams of crab seedlings randomly. The number of converted crabs was 10 to 200,000/kg normal seedlings, and 141 to 160,000/kg were high-quality seedlings, and 24 to 260,000/kg were poor quality. seedling.
(3) Crab transportation: There are dry and wet methods for crab transportation. Dry transportation refers to a method of transporting seedlings made of wooden screens made of wood and embedded with plastic window screening. It is a method of transporting seedlings that maintains certain humidity during transport. Wet transport refers to the use of plastic bags to add water, release seedlings, and seal oxygenated transport. Crab method. The size of the crab seedling transport box is generally 65 cm long, 45 cm wide and 10 cm high. A rectangular (153.5 cm) air window is opened on each side of the box. The bottom of the box and the louvers are each sealed with a 1 mm plastic screen. A group of five seedling boxes are combined and the uppermost layer is capped. After the seedlings are placed, they can be shipped with a rope. The wood for the seedling box is generally made of Chinese fir, which can prevent the box from being deformed after being exposed to moisture, and the layers are not easily connected and fled. The density of the boxed seedlings for each crab should be 1 to 1.5 kg per box. Keep a certain humidity inside the box, and the survival rate can reach more than 90% within 24 hours. Close-range transportation uses plastic seals to transport crabs. The method is to inject 3-5 kilograms of clean fresh water into the plastic bag, put in a small amount of water grass as an attachment to the crab seedlings, and then put it into the crab seedlings and oxygenate it, seal the mouth, and then put the sealed seedling plastic bag afterwards. Put the carton, packaged and shipped. Each 7030 cm plastic bag can ship about 0.5 kg of crab seedlings. The transportation time is within 10 hours and the survival rate can reach more than 90%.
(4) Temporary rearing of crab seedlings: Holding in two stages at a time, primary holding is from the big eye larvae to the metamorphosis stage. In this period, 30 cages are used to make cages; Before the seedlings are placed in the paddy fields, they are mostly raised in fish larvae in the corner of the paddy fields. Should choose the age of enough age, enough desalination, swim fast and robust big eye larvae for a primary hold, the cage to maintain the water depth of 0.6-0.7 meters, leaving 0.3-0.4 meters, the bottom of the tank from the bottom 0.1 meters, per cubic meter The water body can be placed 0.1 kg of seedlings. After 3-5 days of crab seedling metamorphosis, it can be moved into a secondary holding pool. The second holding tank is located at the end of the crab-raising paddy field. Each kilogram of crab needs 40 m2 of water and a water depth of 0.3-0.4 m. Escape walls should be set around the holding pool.
Different juvenile breeding methods are also different. From big eye larvae to metamorphosis, it is better to use fresh leeches, artemia and centipedes, and if it is not enough, fish gizzards, cooked pig blood, and tofu can be used instead. The feed is 30%-50% of the weight of crab seedlings, 1-2 times a day. After the metamorphosis, the feeding of bait to mash the low-quality fish and cooked pig blood, tofu is appropriate, twice a day, around 8 o'clock in the morning, feeding the amount of 1/3 of the day, around 5 pm, feeding The amount accounts for 2/3 of the whole day, and the feeding amount accounts for 30% of the total weight of crab seedlings. During the temporary period, the water should be changed frequently, and the water should be drained once every 1-2 days, drain off 1/3 or 2/3, and then make up the new water.
After the rice fields have finished their operations, the residual period of pesticides and chemical fertilizers has passed, and they can begin to seedling rice fields. Dig a field holding pond and crab field, and fill the water from the inlet, and the crab seedlings will enter the crab-raising paddy field with the water. Before paddy field, paddy field should be filled with new water, with a water depth of 0.1 meters, which can enlarge the larvae of 0.25 kg per mu, and the estimated number of small crabs after being raised is about 12,000.
(5) Feeding management: Crabs growing crab species. Should first cultivate fertilizer and then put the crab. One month after the promotion of the crab seedlings into the field, the feed requires more than 40% protein, plus 0.1% of chitin, and 1.5% of Tian Qing powder. Daily feeding is based on 20%-25% of body weight. 1/3 in the morning at 8 o'clock and 2/3 at 6 o'clock in the evening. From the beginning of August to the middle of September, it is the growth control stage of the crab species, which is generally baited once a day at 6 o'clock in the evening. In the first 20 days, the daily concentrates account for about 7% of the body weight, and young crops account for 50% of the body weight. It accounts for 3% of body weight. Green grass accounts for 30% of body weight. After mid-September, it was the growth and maintenance stage of crab species. All of them were changed to plant feed, such as raw pumpkin and cooked hawthorn, which accounted for 10% of body weight.
(1) Crab crabs slipped in the water plants to cultivate: As the saying goes: whether the crabs are well maintained, first look at plants. After the transplanting of rice in paddy fields, appropriate amounts of plants are required to cultivate crab crabs and crabs, which is conducive to the habitat of crabs. In the hot summer, aquatic plants can absorb a lot of sunlight, effectively reducing the water temperature, and can absorb a large amount of dissolved nutrients in the water to purify the water. The young leaves and roots of aquatic plants are feed for crabs, and the water grass itself is the best concealment for crab shells.